A. Schild (AS) Calibre 5004 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 5004 is a Swiss automatic mechanical movement celebrated for its reliability, precision, and range of functions, including an alarm complication. This movement shares similarities with the AS 5008 but is distinguished by the absence of a calendar module. It was widely used in the 1970s and is coveted by collectors and watchmakers restoring vintage alarm watches.
Key Technical Highlights
Calibre: AS 5004
Movement Type: Automatic, mechanical
Diameter: 30 mm (13.25 lignes)
Height: 6.85 mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 28,800 vibrations per hour (4 Hz)
Functions: Sweep seconds, hacking seconds, alarm function, automatic winding
Power Reserve: Approximately 49 hours
Features: Screw-in alarm components, manual alarm set, stop seconds function
Common Spare Parts and Components
Mainspring and Barrel: Original or New-Old-Stock (NOS) mainsprings provide consistent power delivery and durability.
Balance Wheel and Balance Staff: Precision components for accurate timekeeping and shock resistance; genuine replacements necessary.
Alarm Module Parts: Specialized parts including alarm barrels, hammers, ratchets, and gongs unique to the AS 5004’s alarm mechanism.
Pallet Fork and Escape Wheel: Key escapement parts that require authentic or NOS parts for optimal operation.
Gear Train Wheels: Replacement minute, third, and fourth wheels commonly sourced from NOS stock or donor movements.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fit is vital for smooth time and alarm adjustments.
Jewels: Synthetic ruby bearings reduce friction and wear; replacements must match original layout.
Hands and Dial Components: Authentic parts maintain the vintage look and enhance collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically intended for AS 5004 calibres to ensure proper fit and function.
Handle alarm components carefully during servicing to avoid damage.
Lubricate with modern synthetic oils sparingly, following vintage servicing standards.
Confirm the calibre number on the movement before ordering to avoid errors.
Donor movements are ideal sources for rare or discontinued parts.
Why AS 5004 Spare Parts Matter
Genuine parts maintain the calibre’s precision, robust alarm function, and reliable automatic winding, essential for high-quality vintage watch restoration.
Authentic restorations protect the historical and collector value of AS 5004-equipped timepieces.
Strong technical resources and watchmaker communities support accurate repairs and efficient parts sourcing.
Maintaining your A. Schild AS 5004 calibre with quality spare parts preserves its unique functionality and honors its place in Swiss horology.
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Stem, Crown, Hands & Spares might be available for this movement.
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